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(No Model.)

D' D. HARDY' 3 Sheets-Sheet 1.

STEAM ENGINE.

No.'331,234. .w Pag'emte'dNov. 24, 1885.

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(No Model.) 3 Sheets-Sheet 2.

D. D. HARDY.

.STEAM ENGINE.

No. 331,234. Patented 10324, 1335.

(No Model.) 3 Sheets-Sheet 3. D. D. HARDY.

' STEAM ENGINE.

No. 331,234. Patented Nov. 24,1885.

` Nrrnn STATES ari-Nr irren.

DEXTER D. HARDY, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE ILLINOIS HIGH SPEED ENGINE COMPANY, OF SAME PLACE.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 331,234, dated November 24:, 1885.

Application tiled March 27, 1885.

To all whom, it may] concern.:

Be it known that l, DEXTER D. HARDY, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illi nois, have invented certain new and useful Improvements in Steam-Engines, which are fully set forth in the following specification, reference being had to the accompanying drawings, forming a part thereof, in which- Figure 1 is a front elevation of my engine, having the cover and slide-valve removed from one ofthe steam-chests, so as to show the steamports therein. Fig. 21s a longitudinal section on the line ,e z, Fig. Il. Fig. 3 is a vertical section on the line y y, Fig. l. Fig. 4 is a top View. Fig. 5 is a vertical section of one of the cylinders on the line s s, Fig. 2; Fig. 6 is a top View of a modified form of construcwtion of my engine with the top plate removed,

and Fig. 7 is a detail elevation showing one form of construction of the valve-rod mechanism.

My invention consists, essentially,in a steamengine of two or more single-acting cylinders placed equidistant from each other, and preferably in the same plane around a central driving-shaft, each cylinder being offset at or about half the radius of the crank to one side of a line drawn through the center of the driving-shaft and parallel with said cylinder, and each cylinder being provided with a single-acting piston connected by a separate connecting-rod to the same crank on the central driving-shaft, each of said cylinders being also provided with suitable steam and exhaust ports with suitable steam passages leading therefrom, and having in connection ther e- With a steam-chest and slide-valve operated by an eccentric on the main shaft, all constructed and arranged as hereinafter more fully set forth.

In the drawings, A is the engine-frame, having the cylinders B B attached thereto. Said cylinders are offset or placed, one about half the radius of the crank above and the other the same distance below a line drawn through the center of the driving-shaft F and parallel with said cylinders, the object in so offsetting the cylinders being to make the engine more compact and to give it increased power, ow-

Scral No. 160,176. (No model.)

ing to the less angular thrust of the connecting-rods during their operative stroke than would be the case were the cylinders in a straight line.

M M are steam-chests attached to the cylinders B B. Said engine frame A, cylinders B B', and steam-chests lWI M are all cast in one piece.

L is a steam-passage into which the steam from the stean1-b0iler is admitted through the inlet-opening t' and conveyed to the steamchests M M through the ports a a. A

K is an exhaust-chamber into which the cX- haust-ports J J discharge, and 7L is an exhauststeam pipe leading from the exhaust-chamber.

G G are single-acting pistons adapted to receive steam at their outer ends, and having the recesses k 7c 7c for packing-rings. Said pistons are intruncated in form and are attached to the connecting-rods H H by means of the pins t t', said connecting-rods being attached to the same crank I of the drivingshaft F.

a is the inlet-port from the steam-passage L into the steam-chest M.

b is the inlet-port from the steam-chest M into the cylinder B.

V is one of the slide-valvesoperated'by the valve-rod c.

f f are rods connecting the arms e e, to which the valve-rods c c are attached.

C is an eccentric-rod to operatethe valves, being attached at one end to the eccentric g on the shaft F, and connected to the bar e.

m m are the main bearings in the frame A, in which the shaft F works, the top halves of which bearings are removable.

o 0, u u, and p p are raised portions of the castings covering the steam-passages.

The engine-frame A is cast so as to form with the covers D D an inclosed crank-chamber, into which the innerends of thecylinders B B Open, and in which lubricants are placed for lubricating the entirewinner Workingparts of the engine.

In Fig. 2 one of the pistonsGlis`shown broken away for the purpose of showing the exhaust-ports Z Z, which would be open on the termination of the stroke of said piston G. J J are annular portshone end of which ter- IOO ' b in the cylinder B, and opened the inlet-port into the cylinder B', whence the steam, acting the port a to the steam-chest.

-boiler through the inlet-opening Z to the steam- -being opened by the movement of the valve,

Vit to `move inward to the end of its stroke and vpast the ports ZZ, through which the steam exhausts into the exhaust-chamber K. Durcarrying it through half of a revolution, and

minate in the exhaust-chamber K, and'with which the ports Z Z communicate.

In Fig. 5 a portion of the end of the steamchest, and also a portion of the raised part of the casting o, covering the steam-passage L, is shown broken away in order to show the course of the steam from the passage L th rough Said Fig. 5 also shows the exhaust-passages ZZ, through which the exhaust-steam passes into the annular port J, communicating with the exhaustchamber K.

Figs. 6 and 7 illustrate a modified form of construction of my engine wherein the valvemechanism is placed on the inside ofthe crankchamber S. Instead of the double rods and bars and eccentric and eccentric-rod to operate the valves shown in Fig. 1, the valve-rods c c are extended and connect with a yoke, s, carrying a sliding block, x, in which the eccentric g works. The extensions?n r from the steam-chests to the frame, through which the valve-rods work,are cast with and form a part of the steam chest and frame.

The operation of my engine is as follows: The steam is conveyed by a pipe from the passage L, communicating with both steamchests M Mthrough the ports aa'. The port b .the steam is admitted'into the outer end of cylinder B, and, acting on the piston G, causes ing this movement the force is communicated through the connecting-rod H to the crank I,

in the meantime carrying the piston G' to the position in its cylinder to receive steam. The movement of the valve caused by the action of the eccentric has now closed the inlet-port on the piston G', causes it in turn to move inward,carrying the crank through the remaining half of the revolution and the piston G back to its point of commencement.

Having fully described my invention, whatv I claim as new, and desire to secure by Letters Patent, is-f- 1. In a steam-engine, two single-acting cyl-` inders placed equidistant from each other around a central driving-shaft, each of said cylinders being offset at about one-half of the radius o f the crank to one side of a line drawn through the center of the main shaft .and parallel with said cylinder, said cylinders having in connection therewith suitable steam-chests, steam ports and valves, with suitable mechanism for operating the same, and each cylinder having a single-acting piston connected by separate connecting-rods to the same crank on the driving-shaft in the manner substantially as and for the uses and purposes specified.

2. In a steam-engine having two or more single-acting cylinders placed around a central driving-shaft and offset to-one side of a line drawn through the center of the drivingshaft and parallel to said cylinders, respectively, the combination of the pistons G G', the connecting-rods H H', and the crank I on the driving-shaft F, working in bearings m m', in the manner and for the purposes specied.

3. In a steam-engine, the engine-frame A, having the steam-passage L and exhaustchamber K therein, and the cylinders B B' on opposite sides of the driving-shaft F, and offset, one above and the other below a line drawn through the center of the drivingshaft, and parallel with said cylinders, said cylinders having steam-chests M M, attached thereto with steam-ports a and b, and exhaustports Z Zand J, in combination with the singleacting pistons G G', provided with the packing-rings Zc k, the connecting-rods H H', attached to the crank I, the driving-shaft F, working in bearings m m in the frame A, and the slide-valves o o, in connection with -the bars ee' and rods f f, operated by the eccentric g upon the shaft F, substantially nas and for the uses and purposes specified.

4. In a steam-engine, the engine-frame A, having the steam-passage L and exhaust-chamber K', therein, the parallel offset-cylinders B B', having the ports Z Z and J therein, and the steam-chests M M, having the ports t and b therein, all cast in one piece.

5. In a steam-engine having two cylinders placed at opposite sides of a shaft and offset at opposite sides of a line drawn through said shaft and parallel with said cylindes, the combination of two single-acting valves operated by one eccentric, g, or its equivalent, with the driving-shaft F, and the two singleacting pistons G G', attached to the same crank I, substantially as set forth.

DEXTER' D. HARDY.

Witnesses:

MARTIN L. WHEELER, WILLIAM A. COLEMAN.

IOO 

